White to Alpha?

Question

Hello,

In. the tutorial Characterizer (Adobe Character Animator Tutorial),

there is footage of the black and white sketch puppet overlaid on lined paper. Only the sketched lines of the puppet are visable with the bg paper showing through the blank areas.

Can anyone tell me how this was achived ?

thanks

CoSA_DaveS · Answer

In Photoshop, create a layer and draw with a black brush. Delete the background so you see the checkboard. Anywhere you see checkerboard, it will be transparent. You can place another lined-paper layer behind your drawing layers and it will show through. You can do this in PS, or in Ch itself (in that case the background is effectively a separate puppet made from a lined-paper image, which you add to the scene behind your main puppet).

So the key is the alpha channel (i.e. per-pixel transparency), which happens automatically for PS layers. You just have to make sure you don't have a background layer.

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